Sadly the 70mm bolts dont fit. I was told that the iSonic can take both types of fins the tutle and the deep tutle. But Ive only been given the bolts for deep tutle which is 70mm. Frustrating im sure you can imagine. Ive done a bit more research and at the moment 85mm and 90mm are popping up alot im sure i can go and get some made up. Thanks

Hi Biz,
OK, I understand the problem.
You want to put a std. Tuttle fin in a Deep Tuttle fin box.....correct?
For this you need the 90 cm screws as from the original Larry Tuttle Drawings, the
Deep Tuttle is 17 mm deeper than the Std. Tuttle.
So, check with your nearest Starboard dealer or windsurf shop.
They should have the 6 mm x 1.0 x 90 mm fin screws you need.
They are available, just hard to find.
Roger

Screw fix used to sell packs of 50 for under a tenner but sadly the currently do not stock them. They were 100mm long but we used to just cut them down.

I am sure somewhere online near you will sell them. No need to buy from a ws dealer if they don't have them in stock or want the hassle of ordering just 2 in for you. Just make sure the ones you buy are good quality marine grade stainless or they will rust to smug after the first outing.

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